The 13-year-old was found dead at the scene, police said. The bus driver and two of the passengers were transported by medical helicopter in serious condition to a hospital in Grand Junction, Colorado, and the Utah Valley Medical Center.
Eleven passengers suffered various injuries and were transported by ambulance to hospitals in Price and Richfield. One passenger was uninjured.
The cause of the crash is still under investigation, but a passenger told police the driver may have had a medical issue, according to Utah Highway Patrol trooper Jared Cornia.
The bus was en route to Las Vegas, Nevada.
Identification of the victims has not yet been released, pending notification of family.
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